Re: [libvirt-users] how to match the ID of a LUN in a storage pool with the GUID on the target server

From: "Daniel P. Berrange" <berrange redhat com>

To: Tom Georgoulias <tomg mcclatchyinteractive com>

Cc: "libvirt-users redhat com" <libvirt-users redhat com>

Subject: Re: [libvirt-users] how to match the ID of a LUN in a storage pool with the GUID on the target server

Date: Wed, 16 Jun 2010 18:41:30 +0100

On Wed, Jun 16, 2010 at 01:20:02PM -0400, Tom Georgoulias wrote:
> I've configured a libvirt storage pool using an iscsi target from a Sun
> 7310 storage appliance and am using the LUNs in this target as volumes
> for my KVM guests. The setup is very similar to what Daniel covered in
> a recent blog posting:
>
> http://berrange.com/posts/2010/05/05/provisioning-kvm-virtual-machines-on-iscsi-the-hard-way-part-2-of-2/
>
> It works great, but I can't figure out how to match the volume names &
> path IQNs within the storage pool to the GUIDs on the target.
>
> For example, here's what I see when I use the vol-info command:
>
> # virsh vol-list kvm-target
> Name Path
> -----------------------------------------
> 6.0.0.0
> /dev/disk/by-path/ip-X.X.X.X:3260-iscsi-iqn.1986-03.com.sun:02:<snipped>-lun-0
> 6.0.0.1
> /dev/disk/by-path/ip-X.X.X.X:3260-iscsi-iqn.1986-03.com.sun:02:<snipped>-lun-1
>
> The IQN matches the targets IQN, but when I browse the LUNs from the
> storage system I do not see a way to determine which of them is *-lun-0
> and which is *-lun-1, I only see a GUID and an alias name that I created.
>
> Is there any way to get that info (or something else that will do the
> job) from a virsh command?
Nothing at this time. If you weren't using libvirt, how would you discover
the GUIDs on the Linux client ? If there is a way to get these from sysfs
or elsewhere, we can wire it up in libvirt to the <key> element in the XML
for the volume. I just don't know how yet...
Regards,
Daniel
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